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Tính: \(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{200}}{\frac{1}{199}+\frac{2}{198}+\frac{3}{197}+...+\frac{198}{2}+\frac{199}{1}}\)
cho A /\(\frac{1}{199}+\frac{2}{198}+\frac{3}{197}+...+\frac{198}{2}+\frac{199}{1}\)
cho B:\(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{200}\)
Tính A:B
\(\left(x-20\right)\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{200}}{\frac{1}{199}+\frac{2}{198}+\frac{3}{197}+...+\frac{198}{2}+\frac{199}{1}}=\frac{1}{2000}\)
(x-20).\(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{200}}{\frac{1}{199}+\frac{2}{198}+\frac{3}{197}+...+\frac{198}{2}+\frac{199}{1}}\)=\(\frac{1}{2000}\)
Giúp mk với
tính A/B biết
A=\(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{200}\)
\(B=\frac{1}{199}+\frac{2}{198}+\frac{3}{197}+...+\frac{198}{2}+\frac{199}{1}\)
Cho: \(A=\frac{1}{2}+\frac{1}{3}+...+\frac{1}{200}\)
\(B=\frac{1}{199}+\frac{2}{198}+...+\frac{198}{2}+\frac{199}{1}\)
Tính \(\frac{A}{B}\)
Tính:
\(a.A=\frac{3}{3.5}+\frac{3}{5.7}+...+\frac{3}{49.51}\)
\(b.B=\frac{1}{2}+\frac{1}{3}+...+\frac{1}{200}\)
\(\frac{1}{199}+\frac{2}{198}+...+\frac{198}{2}+\frac{199}{1}\)
Tính B=\(\frac{1}{199}+\frac{2}{198}+\frac{3}{197}+....+\frac{198}{2}+\frac{199}{1}\)
tính
A=\(\frac{\frac{1}{199}+\frac{1}{198}+....+\frac{1}{1}}{\frac{1}{2}+\frac{1}{3}+....+\frac{1}{200}}\)